catastrophic

[kat-uh-strof-ik]
adjective
of the nature of a catastrophe, or disastrous event; calamitous: a catastrophic failure of the dam.
Sometimes, catastrophical, catastrophal [kuh-tas-truh-fuhl] .

catastrophically, adverb
noncatastrophic, adjective
noncatastrophically, adverb
supercatastrophic, adjective
uncatastrophic, adjective
uncatastrophically, adverb
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World English Dictionary
catastrophe (kəˈtæstrəfɪ)
 
n
1.  a sudden, extensive, or notable disaster or misfortune
2.  the denouement of a play, esp a classical tragedy
3.  a final decisive event, usually causing a disastrous end
4.  Also called: cataclysm any sudden and violent change in the earth's surface caused by flooding, earthquake, or some other rapid process
 
[C16: from Greek katastrophē, from katastrephein to overturn, from strephein to turn]
 
catastrophic
 
adj
 
cata'strophically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Moreover, auto insurance covers catastrophic loss, but not the day-to-day
  maintenance of the car.
If the rain is heavy, prolonged and falls over larger areas, the presence of
  trees will not prevent catastrophic floods.
One of the potentially catastrophic consequences of the region's fragile water
  balance is the effect on political tensions.
But climate change and exotic weeds may exacerbate the risk of catastrophic
  fires.
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